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MJM · 05-08-2008, 07:13 AM

Hello all,

Due to a low volume of water running through the cooling system, I've come to the conclusion that it's time to replace the impeller on my 2002 Merc 25HP 4-stroke. (I hear some people actually replace theirs every year as a preventative measure...I have never replaced this one.)

Anything I need to specifically be on the watch for?

Do I need to drain the gearcase oil first, or will I not be encroaching on that cavity?

Thanks in advance for the advice/tips!

05-08-2008, 07:13 AM	#1
MJM Senior Member Join Date: Jul 2005 Posts: 262 Thanks: 0 Thanked 23 Times in 11 Posts	Merc 25hp Impeller Replacement Hello all, Due to a low volume of water running through the cooling system, I've come to the conclusion that it's time to replace the impeller on my 2002 Merc 25HP 4-stroke. (I hear some people actually replace theirs every year as a preventative measure...I have never replaced this one.) Anything I need to specifically be on the watch for? Do I need to drain the gearcase oil first, or will I not be encroaching on that cavity? Thanks in advance for the advice/tips!